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Finding the Fourth Proportional to 979.12, 1,350.96 and 683.92

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Solution

The fourth proportional to 979.12, 1,350.96 and 683.92 is: 943.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.12 : 1,350.96 = 683.92 : x
  2. Step 2: Convert to fraction form
    979.12/1,350.96 = 683.92/x
  3. Step 3: Cross multiply
    979.12x = 1,350.96 × 683.92
  4. Step 4: Simplify right side
    979.12x = 923,948.56
  5. Step 5: Solve for x
    x = 923,948.56/979.12
  6. Step 6: Final answer
    x = 943.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.